Scriber and ellipsograph



Jan. 7, 1930. E. o. CLARK SCRIBER AND ELLIPSOGRAPH Filed June 25, 1927 2 Sheets-Sheet 2 INVENTQR U v BY j r I v ATTORNEY I dQM-M Patented Jan. 7, 1936 :umren PA NT @QE'FLCE -SORIBER AND nrrlrrsoermrn ppl at on filed June 5,

EEhi invent en' el tes {to geometr cal instruments andhasior itsobj eottheprovision of a ,oombined novel ,scriber :by means vof hich cire e el ips end th lik a b 5 aw upenivvcr of any k nd an 9, i e

ts nfec end n v i p s tions- An important obj eat ,of the invention is to proyidea deviceofithis charaeter which will beveryisimple andeasyto adjustand which 1 may b use to nsc ib l ne ro -vm r s ep c irregular sur taces.

.Ane ditione Obje is o pro id deyie ith seha aete whi h W lh simpl -and inxpensiv olman ifeqmr pels ti e i M e.

15 eflicient and durable in service, anda general improvemen he rt- W thhe ab v an Bothe xobis t en adantages i i v th inventien pr i ebly ensi t inithei tailsi f s n true on en the :20 arra gemen a d embin tione or a t t b r ne tenm r f l vdese ih d n i ele meil, nd ill st ated n th ,e qmpepy i g ew.- ings, -,vvh eh figur lz eside l ye ien Oi th eleVie eur zis a ross se t ene jvievit kewn he 'iner2r 1Q E ur 1- F g refi i e e a s etieea efiewitekewp th linei3s of 'Fi erefligure. -i a v rtic iem sseeti ee r etei v wteke Q t in fi i P 1 F gur isi s d el vetiq e hew n fl eeeiQni m mb of aid fieren rfeem Figurei si e e eve io rg the devi e erranged iordrawing an ellips es. I

Figure'Tis atopplan View thereof. Figure 8 is a detail sectional yiew talren on theline 8+8 of Figure-7,7 and -1 Tigur 9 is a ei sept ne vi w-sh w ng theinounting. of one of the scriber points, the view being taken on the gline '9 9 of :Figure 7.

Referring more particularly to the, drawings, the numeral 10 designates, generally r la vely:stet on vmemh h r ish w comprising ;a doot pieee 11 provided with s'pae d ups anding e rs l2 hetween hich i p voted, at 1 Mm zlh e minating a head 15 formed with a circular opening through which is rotatably anld yerticallyad iil ab y m unted he rqd rl v edee e to-b zhe d 4 1927. Serial em. 201,447.

in selected ,rotatably ,or fivertically adjusted pesrtion by, means of a set, screw 17' or vthe like. At; its :lower end thisrod is preferably tapered 0r,,pointed asflindieatedat 18 so that it may serve :itself as va center instead of reliance ;being placed upon the footpiece 11 in casethe latter isnot desiredtozbe employed. 1 At its upperlend the r'od16 is' preferably .provided with aiknob orgbutton l9 itowhich pressure may be;applied f0r.the purpose of holding the rod 116 stationary :in vertical fposition' during the operation ofthe device or so thatpressure mayzbe applied thereto while turning movementr is simultaneously imparted lthereto.

.Slidabl'y mounted upon, the rod 16 is a carriage =20 fherej shown as ,comprising a body member 21 havingtits ends formed as or with bosses with .circular .openings therein through which thejrod 516 extends, set screws 23 :being; provided for the ,purpose of maintaininglthisiearri age in a vertically or rotatablyladjusted positiorlwithresp'et to the rod. In case it :is desiredztoipermit this carriage to be rotatable upon the rod 16, use may be made of a collar24 'serving as a stop, this collaribeing located ofcourse'below-the carriage and heingflprovidedwithaset screw25 whereby it may be held in any desirediadjusted position vertically along; the .rod.

fihe device 'gi'nrther includes an elongated arm :26 which maybe formed: as a fiat Istrip providechwithalongitudinal slot 2-7 fort-he accommodation of 'a clamping screw 28 which extendsintoasuitahly threaded holein vthe lower end of thecarriage 20,. thev purpose being to clamp the arm 26 at anydesired adjusted position withvresp'ectto the rod 16.

At its end I most remote from the rod 16, this arm 26 carries a member 28 shown in detail in Fi ure 4, which member istherein represented asibeing of cylindricalshape to receive the'rod 29 of an extension member,a clamping screw 30 being.providediorthe.purpose ofeontracting the memher28 about: the rod 29. The rod 29 gis ofeourse slidalole with respect to the member 28 and carries aearr ee h v g Q rq tiens '3 h eon through which is Vertically i djujst bl mounted fire edep'ted t hehe d il ediu rQS Qm y:les et-s r .3f T f lh zlower lee boss member 32 carries a clampin screw 35 which passes through an elongated slot 36 in an L-shaped arm 37 which has, its vertical arm 38 terminating in a point 39 adapted to serve as a scriber. The rod 33 likewise terininates'in a point 40 though it is of course 7 apparent that the member 33 instead of be-.

ing a rod may be an ordinary lead pencil if such is desired. Itis also clear that the arm 37 may be omitted in case such is desired or Whenever it is contemplated to scribe a line with the point 40 or with a lead pencil replacing the point 40. A purpose in having 1 the arm 37 in addition to the point 40 is to 'vermit the making of concentric lines.

In the operation 'of the device thus far described, it will be readily apparent that when the foot member, 11 is placed upon a suitable surface and the rod 16 arranged in vertical oosition, a circle may be inscribed by rotating the arm 26 about the rod 16 or with the rod 16 within the member 14 as a'bearing. It is also clear that, if desired, the collar 24 may be lifted to thedesired position and lamped in such position upon the rod 16 and the carriage 20 permitted to rotate upon the rod 16. If this is the arrangement a circle may be drawn in exactly the same manner as. above described. It is of course not necessary always to use'the foot piece ll'as it is quite true that the point 18 o the rod 16 may be employed as the pivot, the rod 16 in th1s instance being entirely removed from the member 11 by loosening the screw 17 and withdrawing the rod from the arm 14 as will be readily apparent. Byadjusting the arm 37 properly with respect to the point 40, it is quite apparent that concentric circles different distances a art may be drawn with the utmost ease. I it is desired to draw only one circle, the arm 37 may be removed and the point or a lead pencil in place thereof utilized as the scriber.

In some instances, it ma be desirable to employ the device for scri ing ellipses. If

such is the'case, it is readily apparent that V the arrangement may be as disclosed in Figure 6 of the drawings. Referring to this figure in detail, the numeral 41 designates a base member from which rises a rod 42 on which is vertically adjustably mounted a collar member 43 through which is slidable a 'rod' 44 which may be the identical rod 16 above described and which may carry the carriage -20 likewise above described, with which car- 7 screws 46 or the like. The arm 26 being of course arranged in the desired position with respect to the rod 44 and held, though capable of rotary movement, by means of the clamping screw 28. In this form there may be provided a scriber point 56 having a reduced shank 57 passing through the slot 27 in the arm 26 and equipped with a clamping nut 58 for maintaining it in an adjusted position. The carriage device 31 and its associated parts may be carried by the arm 26 in a manner described in connectionvwith Figure 6. In this form of the invention it is readily apparent that if the footmembers be placed against some flat surface and the arm 26 adjusted to give the proper position between the pivot screw 28, the scriber point 56 andthe scriber point 40 carried by the member 31 concentric circles may readily bedrawn. In Figure 5, I haveillustrated an extension member or modification-to replace the structure illustrated inFigurel Referring to this figure in detail it will be observed that I have illustrated a carriage 47 corresponding to the carriage 31 and provided with a stem 48 adapted to be received within the member 28 carried by the arm 26. However, in this instance, the carriage terminates in an ear 49 with which is pivotally connected at 50, an elongated arm 51 having a slot 52 along which is adjustably mounted, by means of a screw 53, a carrier member 54 for carrying a lead pencil or other scriber 55. r p

From the foregoing description and a study of the drawings, it will be apparent that I have thus provided a'simply constructed, inexpensive and .1 very easily adjusted and operated device by means of which circles either singly or in" concentric relation may be drawn uponflat-or upon irregular surfaces. The arrangement of parts is also such that if desired the device, maybe placed against a vertical surface for drawing circles upon a upon the nature of the work to be'done. Fur

. horizontal surface, and-vice versa, depending.

thermore, surface irregularities will have no effect upon thejdevice inasmuch as itmay be caused to operate with perfect satisfaction under any and all'conditions. It is believed that the construction, operation and advantages will be readily apparent to one skilled in the art without further explanation.

While I have shown and described the preferred embodiment of theinvention, it should of course be understood that I reserve the otally connected with said ears and formed with a bearing portion'having a, set screw therein, a'rod rotatably adjustably mounted withinsaid' bearing portion and'adapted to.

be clamped by said screw, a carriage slidably and rotatably mounted upon said rod and having clamping means for maintaining an adjusted position with respect thereto, an elongated arm having a longitudinal slot, a pivot secured to the carriage and passing through said slot, a clamping screw on said pivot, a member carried by one end 01": said arm, a stem slidably mounted within said member, a carriage carried by said stem and having boss portions, a soriber mounted for sliding movement through said boss portions, and an auxiliary soriber pivotally and slidably connected with the second-named carriage.

In testimony whereof I aflix my signature EDWARD O. CLARK, 

